package com.zfj.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.zfj.entity.EduSubject;
import com.zfj.entity.excel.SubjectData;
import com.zfj.handler.GuLiException;
import com.zfj.service.EduSubjectService;

/**
 * @author zhangfujing
 * @date 2022/10/6 10:55
 */
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {
    //因为SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象
    //不能实现数据库操作
    public EduSubjectService subjectService;
    public SubjectExcelListener() {}
    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }
    //读取一行一行
    @Override
    public void invoke(SubjectData data, AnalysisContext context) {
        if(data==null){
            throw new GuLiException(20001,"文件数据为空");
        }
        //一行一行读取，每次读取两个值，第一个值一级分类，第二个值二级分类
        //判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, data.getOneSubjectName());
        if(existOneSubject==null){
            existOneSubject=new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(data.getOneSubjectName());//设置一级分类名称
            subjectService.save(existOneSubject);
        }
        //获取一级分类id值
        String pid=existOneSubject.getId();
        //二级分类
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, data.getTwoSubjectName(), pid);
        if(existTwoSubject==null){
            existTwoSubject=new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(data.getTwoSubjectName());//设置二级分类名称
            subjectService.save(existTwoSubject);
        }
    }

    //一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService subjectService,String name){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    //二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {

    }
}
